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Old 09-28-2008, 08:04 AM   #1
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Formula for Main upgrade


Just curious!!!

How do you Know when to upgrade the main panel???

Is there a percentage formula

I have a 150 amp main with 6 open spots.

I have added up all the breakers in now and came up with 335 amps.

Thanks

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Old 09-28-2008, 08:22 AM   #2
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Formula for Main upgrade


hogger9, Adding all the breakers up isn't the right way to go about it. It's like saying, "I can't be broke, I've still got some checks left." You need to figure out what your total load is. Do you have an electric stove, electric dryer, hot water heater, lots of electric heaters, is your garage a wood working/auto repair shop, etc.? How many electric appliances? Do you have a huge house? Are you pushing the 150 amp envelope? What about your future plans? Central air? Hot tub/sauna? If you have a mechanical electric meter, is it spinning like a top? For your average homeowner 150 amps is plenty. Hope this helps, pete

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Old 09-28-2008, 09:24 AM   #3
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Petey_c

I was thinking of that checking analogy when I was posting....
I was just trying to do some info gathering for longterm plans.
I just thought that there was a Quick GENERAL formula.
Nothing special at the house, 2000 sq ft,no heavy use.
Just wonderin!!!!
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Old 09-28-2008, 09:30 AM   #4
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Quote:
Originally Posted by petey_c View Post
hogger9, Adding all the breakers up isn't the right way to go about it. It's like saying, "I can't be broke, I've still got some checks left."
I LOVE THIS!

I never heard that analogy before. Can I use it, or is it copyrighted?
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Old 09-28-2008, 10:01 AM   #5
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Formula for Main upgrade


I thought it was pretty good also.
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Old 09-28-2008, 11:12 AM   #6
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Quote:
Originally Posted by Speedy Petey View Post
I LOVE THIS!

I never heard that analogy before. Can I use it, or is it copyrighted?
You must be joking..... Feel Free.. I think ALL Blondes use this(my wife for one)

Last edited by hogger9; 09-28-2008 at 11:23 AM.
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Old 09-28-2008, 12:02 PM   #7
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Quote:
Originally Posted by hogger9 View Post
...How do you Know when to upgrade the main panel???
Well if the old panel is a fuse box, an old rusted unsafe wiring mess, a brand/model of panel which has been known to be unsafe, breakers are hot to the touch, or the main breaker keeps tripping, then a good idea to replace the panel and maybe upgrade to more amperage.

If the main breaker keeps tripping, then need to upgrade the service to more amperage.

In some cases, you might just replace the panel, but not upgrade to more amperage.

If the main breaker trips, this means you are using more amperage than the panel was designed to carry.

So the main breaker tripping is one indication. If it is not tripping and you are not planning on adding anything new, then don't worry about it.

Or maybe you don't like the looks of the thing and want to clean things up a bit and modernize, and have extra money laying around, then replace and upgrade!

You can use the link below to come up with total wattage for everything you would ever have turned on at the same time. Then convert the watts to amps at the second link.

Individual items on at same time list/calculator
http://www.thesolarguide.com/calc.aspx

Convert watts to amps (under single phase)...
http://www.jobsite-generators.com/po...lculators.html

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